Devil Peak, Ralston Divide District, Placer Co., California, USA
|Latitude & Longitude (WGS84):||38° 57' 32'' North , 120° 32' 49'' West|
|Latitude & Longitude (decimal):||38.95889,-120.54694|
|Köppen climate type:||Csa : Hot-summer Mediterranean climate|
A summit located along Big Grizzly Canyon.
The USGS describes Devil Peak as an unclassified Paleozoic metamorphic rock. In actuality Devil Peak is a mid-grade metamorphic mica schist, consisting of muscovite replacement of amphibole (probably hornblende). This alpine facies was broken and intruded by hydro-thermal quartz. The quartz has many vugs that produce large quartz crystals, often with interesting inclusions.
8 valid minerals.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
|Triassic - Ordovician|
201.3 - 485.4 Ma
|Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada)|
Age: Phanerozoic (201.3 - 485.4 Ma)
Stratigraphic Name: Calaveras Complex; Shoo Fly Complex; Blue Canyon Formation; Briceburg Formation; Cape Horn Slate; Delhi Formation; Hite Cove Formation; Kanaka Formation; Relief Quartzite; Tightner Formation
Comments: Western Sierra Nevada. Lower Paleozoic Shoo Fly Complex and upper Paleozoic to lower Mesozoic Calaveras Complex, undivided. Deformed and metamorphosed rocks composed primarily of quartzite, argillite, and chert; includes melange
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. 
|Devonian - Silurian|
358.9 - 443.8 Ma
|Paleozoic sedimentary and volcanic rocks|
Age: Paleozoic (358.9 - 443.8 Ma)
Comments: Mccloud Arc
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529.